DRILLING HYDRAULICS: Pressure losses through the system -- Optimum flow rate -- System constraints -- Annular hydraulics -- SAMPLE CALCULATIONS: Calculations for the end of the run -- BIT HYDRAULICS: Bit hydraulics -- Development of the layer of fines -- Intensifying jet action on bottom -- Practical options to adjust X/D ratios -- Placement of nozzles -- DOWNHOLE TOOLS: Measurement while drilling (MWD) -- Downhole motors -- PHYSICAL AND CHEMICAL PROPERTIES OF WATER-BASE DRILLING FLUIDS: Rheology -- Determination of PV and YP -- Determination of n and K.